Homemade Sensitive Listening Device
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This is a file that tells how Mike from Michigan built his very sensitive listening device .
Can you find a listening device in the picture??? Look closer --There is a clue in the second picture .Once built this listening device was able to hear a low whisper at 1200+ feet in open line of site -- 600' thru trees/brush. It can be built in almost no time at all .
Long Range Listening Device
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